NORD Drivesystems U21010 - Manual (Page 2)

5. Friction disc replacement
A. Separate the driven disc assembly from the driving disc
assembly (See Separate Instructions).
B. Once the friction disc (Item 409), is exposed remove the
socket head cap screws (Item 410) that hold the friction
disc or friction ring (Item 409) to the friction disc carrier
(Item 407).
C. Clean the contact surface between the friction disc and
friction disc carrier.
D. Vacuum or brush out the NORDISC™ drive housing to
remove accumulated friction material dust. Be careful
not to ingest dust while cleaning.
E. Inspect main housing for damaged parts while
disassembled.
F. Attach the new friction disc to the carrier using the
socket head cap screws. Permissible tightening torques
are per the table below:
Type Screw
Size
Material
Grade
Tightening
Torque
RV10 M5 X 12 8.8 6 N-m / 53 lb-in
RV20 M5 X 16 8.8 6 N-m / 53 lb-in
RV30 M6 x 16 8.8 10 N-m / 88 lb-in
RV40 M6 x 20 8.8 10 N-m / 88 lb-in
G. Re-assemble intermediate housing or “RV” housing
(Item 447) to output bearing housing (Item 402). To
re-assemble, apply Steps 1-4 in reverse order. Use a
thread-locking compound to secure the hex head
screws.
6. Bearing and seal replacement - NORDISC™ output
A. Separate the driven disc assembly from the driving disc
assembly (See Separate Instructions).
B. Slide the intermediate housing (Item 447) away from
the output housing (Item 402) and remove the shaft oil
seal (Item 439).
C. Remove circlips/snap-rings (Item 437 and 438).
D. Remove shims and supporting disc (Items 434 & 436).
E. Slide the hollow shaft/friction disc carrier assembly
(Item 404) away from output housing (Item 402).
F. Press output gear-shaft (Item 424 or 425) and bearing
(Item 435) out of output housing. Shaft and bearing
come out on the output or gear-shaft side.
G. Remove oil seal (Item 421) from output housing.
H. Remove two circlips/snap-rings (Items 418) from output
housing and remove needle bearings and spacer (Items
419 and 420).
I. Re-assemble in the reverse order, replacing ball bearing,
needle bearings, and oil seals (Items 435, 419, 421 and
439). If required, also replace any shims, spacers, or
circlips (Items 434, 436, 420, 437, 438, and 418).
During assembly, repack bearings with a lithium-based
NLGI #2 grease. Needle bearing cavity should be
approximately 1/3 full after re-greasing.
WARNING
• The output shaft compression spring (Item 430) does
not require maintenance. If the spring fractures the
complete shaft should be replaced as a complete
assembly or returned to NORD Gear for repair.
• Special fi xtures are required to remove and install the
spring. Personal injury can result if this repair is
attempted in the fi eld.
424
425
437
434
436
438
439
435
402
404 430 421
410
409
407
418 418
419
420
419
DRIVESYSTEMS
NORDISC
™
ADJUSTABLE SPEED DRIVES
RETAIN FOR FUTURE USE U21010 - 2 of 6
www.nord.com/docs 06.09.09
NORD Gear Corporation
Toll Free in the United States: 888.314.6673
NORD Gear Limited
Toll Free in Canada: 800.668.4378